function setchan(port,bit,mode)

%    SOSI-M2 V1.0 MATLAB M-file
%
% Set channel mode to analog input, digital input, or digital output
%
% Args: sosibit(port,bit,mode)
%
% port: 'COM2', for example
% bit: channel 0 - 6
% mode:  'ai'  analog input
%        'do' digital output
%        'di' digital input

% Check input argument
if strcmpi(mode,'ai')
elseif strcmpi(mode,'do')
elseif strcmpi(mode,'di')
else
    disp('Argument error: mode');
    return;
end

try

% Set up port
    spo=serial9600(port);
    wakeupsub(spo);

% Change channel mode
    setchansub(spo,bit,mode);

% Done
    fclose(spo);
    return;

catch
    s=lasterr;
    disp(s);
    fclose(spo);
    return;
end